21-FII low-voltage TEFC induction motor 400–690 V, 37–1400 kW
Country: Japan · Model: 21-FII
Three-phase squirrel-cage induction motors 21-FII in the TEFC version for 400–690 V, with a power of 37–1400 kW. IEC frame sizes 250–500, 2–10 poles, degree of protection IP44–IP55. They are installed on pumps, fans, compressors and conveyors in the oil and gas, chemical and mining industries.
- Power
- 37–1400 kW (50–1850 hp)
- Number of poles
- 2–10 (2 poles up to frame size 400)
- Frame sizes (IEC)
- 250–500
- Version
- TEFC (totally enclosed fan cooled), cast iron ribbed frame
Technical specifications
| Power | 37–1400 kW (50–1850 hp) |
|---|---|
| Number of poles | 2–10 (2 poles up to frame size 400) |
| Frame sizes (IEC) | 250–500 |
| Version | TEFC (totally enclosed fan cooled), cast iron ribbed frame |
| Degree of protection | IP44–IP55 |
| Rotor | cast aluminium cage |
| Insulation class | F |
| Standards and certificates | IEC, NEMA, BS, AS; ISO 9001/14001; Lloyd's, Baseefa, CSA |
| Voltage | low-voltage versions from 400 V (series: 400 V – 6.6 kV), 50/60 Hz |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The rotor with a cast aluminium cage withstands frequent starts and has a low moment of inertia. The cast iron ribbed frame with improved airflow raises efficiency and gives more power in the same frame size. Bearing units with a doubled grease replenishment interval are lubricated while running through grease nipples, and the used grease is collected in a removable cassette; the bearings are ball or roller. The top terminal box rotates through 90°, and angled mounting gives side cable entry. The insulation is class F, and the motors are compatible with frequency converters. Three-dimensional analysis of thermal and magnetic fields reduced size, noise and vibration. Manufacturing follows ISO 9001 and ISO 14001, with Lloyd's, Baseefa and CSA certificates and compliance with IEC, NEMA, BS and AS.
How to choose
The series as a whole covers 37–1400 kW (50–1850 hp), 2–10 poles, a frequency of 50 or 60 Hz and a voltage from 400 V to 6.6 kV. The specific power at low voltage is set by the frame size and the number of poles, and two-pole motors are available only up to frame size 400. For replacing frame 800 DC motors in rolling mills there is a separate TM-AC 800 Frame.
Request a price and lead time
21-FII low-voltage TEFC induction motor 400–690 V, 37–1400 kW. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What does TEFC mean in the 21-FII motor?
A totally enclosed version with external fan cooling. The frame is cast iron ribbed, degree of protection IP44–IP55.
What are the power and frame size ranges of the low-voltage 21-FII motors?
37–1400 kW in IEC frame sizes 250–500, 2–10 poles. Two-pole machines are made up to frame size 400.
Can the motor be supplied from a frequency converter?
Yes, the motors are compatible with frequency converters, with class F insulation.
How are the bearings lubricated?
While running, through grease nipples; the replenishment interval is doubled, and the used grease is collected in a removable cassette.
What certificates does the series have?
Manufacturing to ISO 9001 and ISO 14001, Lloyd's, Baseefa and CSA certificates, compliance with IEC, NEMA, BS and AS.
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Need a price, lead time or replacement?
Send us a request and we will confirm the configuration, lead time and delivery terms. We reply by email.